Bootstrap's Column Width

I’m having a lot of component UI trouble trying to keep columns width static in my UIs.

I know KNIME uses the Bootstrap method of 12 possible columns which could occupy:

“widthXS” : 1

…

“widthXS” : 7

…

“widthXS” : 4

and each column occupying a percentage of the width of the window.

Question: Is there a way to make column 1 static? Like “width: 100px;”?

Any thoughts?

Phil